linux-kernel - Re: [PATCH] scsi: qla4xxx: check for null return from iscsi_lookup

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Message-ID: <20170508120940.lb7qzzbrkzch47ww@mwanda>
Date:   Mon, 8 May 2017 15:09:40 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: qla4xxx: check for null return from
 iscsi_lookup_endpoint

This should be CC'd to QLogic-Storage-Upstream@...gic.com as well.

regards,
dan carpenter

On Sun, May 07, 2017 at 10:30:20PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> iscsi_lookup_endpoint can potentially return null and in 9 out of
> the 10 calls to this function a null return is checked, so I think
> it is pertinent to perform a null check here too and return -EINVAL
> as in the other null cases.
> 
> Detected by CoverityScan, CID#147282 ("Dereference null return value")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/scsi/qla4xxx/ql4_os.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
> index 64c6fa563fdb..803e342e1093 100644
> --- a/drivers/scsi/qla4xxx/ql4_os.c
> +++ b/drivers/scsi/qla4xxx/ql4_os.c
> @@ -3189,6 +3189,8 @@ static int qla4xxx_conn_bind(struct iscsi_cls_session *cls_session,
>  	if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
>  		return -EINVAL;
>  	ep = iscsi_lookup_endpoint(transport_fd);
> +	if (!ep)
> +		return -EINVAL;
>  	conn = cls_conn->dd_data;
>  	qla_conn = conn->dd_data;
>  	qla_conn->qla_ep = ep->dd_data;
> -- 
> 2.11.0
> 
> --
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